Telephone switch system



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TELEPHONE SWITCH SYSTEM.

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TELEPHONE SWITCH SYSTEM.

No'. 409,574. Patented Aug. 20, .1889,

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UNITED STATES PATENT OFFICE.

CLAUDE C. COULD, OF BATAVIA, ASSIGNOR TO THE EASTERN ELECTRICAL MANUFACTURING COMPANY, OF VHEATFIELD, NEV YORK.

TELEPHONE SWITCH SYSTEM.

SPECIFICATION forming part of Letters Patent No. 409,574, dated August 20, 1889.

Application lcd .farol 12, 1887. Serial No. 230,616. (No model.)

.To all whom t may concern: a3 represents the drop or apron, and a4 the Be it known that I, CLAUDE C. GOULD, of horizontal locking-bolt, which is moved rear- Batavia, in thc county of Genesee and State wardly when the apron drops by the tail a of New York, have invented new and useful of the apron striking the front end of the 55 5 Improvements in Telephone Switch Systems, locking-bolt.

of which the following is a specification. B represents the upright shifting-bar ar- This invent-ion relatesv to a switch-board ranged on the rear side of the upright porsystem in which each main or subscribers tion A of the switch-board, and provided line is provided in the central office with a with vertical slots l), by which the bar is 6c io movable terminal which is automatically guided in its vertical movements on studs'or moved out of its normal position so as to break screws h', which are attached to brackets b2, the connection with the ground upon sending secured to the switch-board. The slots l) a current through the line. Switch-board limit the vertical movement of the bar B on systems of this kind are described and shown the studs l2. 65 i 5 in Letters Patent of the United States, Nos. c represents a shoulder formed in the rear 355,923 and 355,929, granted to C. C. Gould sideof the sl1ifti1ig-barl$,1iear the upper end and W. Smith, on the lith day of January, thereof, and engaging with a projection c', 1887. formed on the rear end of the locking-bolt at,

The objectof this invention is to facilitate whereby the upright shifting-bar B is heldin 7o 2o and expedite the operation of connecting' difan elevated position. Vhen the locking-bolt ferent subscribers; and my invention consists a* is moved backwardly by the apron, the proof the improvements which willbe hereinafter j ection c releases the upright shifting-bar B fully described, and pointed out in the claims. and allows the latter to drop. The downward In the accompanying drawings, consisting movement of the bar B is accelerated by a 75` 2 5 of two sheets, Figure l is a vertical section of spring c2. The upperend of the upright shiftmy improved switch. Fig. 2 is a side elevaing-bar B is beveled or inclined, as shown at tion of the pivoted frame forming part of the c3, so as to move the locking-bolt a* backswitch. Fig. 3 is a sectional elevation of the wardly when the upright bar is raised. The upper part ofthe pivoted frame on an enlocking-bolt d4 is returned to its forward po- 8o 3o larged scale. Fig. 4l is a horizontal section in sition by a spring of.

line x 00, Fig. 3. Fig. 5 is a horizontal section D represents the subscribers telephone; d, of one of the out-sockets. Fig. 6 is a crossthe ground-wire thereof; d', the wire ruiming section of one of the out-sockets. Fig. 7 is from the telephone D to a contact-point d?, an edge view of one of the plugs. Fig. 8 is a secured to the' upright portion of the switch- 8 5 3 5 cross-section of the same. Fig. 9 is a diagram board; d3, the wire running from the contactof two sectional switch-boards provided with point d2 to the armature-coils; (Z4, the wire my improvements. Fig. l() is a vertical'secrunning from the armature-coils toa contacttion of one of the out-sockets on an enlarged point (Z5, secured to the switch-board below scale. Fig. ll is a side elevation of the the contact-point (l2. 90 4o ground-lever and connecting parts. Fig.'l2 d is a contact-bow secured to the side of is a rear elevation of the upper portion of the the upright shifting-bar B, and bearing in the vertical shifting-bar. upper position of the bar against the upper Like letters of reference refer to like parts contact-point d2 `and in the lower position of in the several figures. the bar against the lower contact-point d5. 9 5

45 A represents the upright portion, and A E represents a hollow frame or case, which the horizontal portion, of a telephone switchis supported on the horizontal portion A of board. the switch-board by horizontal pivots e, on

a represents the supporting-frame of the which the frame E can be tilted. The frame annunciator secured to the upright portion A is held in an upright position by a .spring e', roo

5o of the switch-board and carrying the coils d which is secured to the switch-board, and

and the armature-lever a2. whichbears against the rear side of the frame.

The lower end of the frame E projects downwardly through an elongated opening c2 in the switch-board.

f represents a contact-poin tI projecting rear- .wardly from the lower end of the frame E,

end with a contact-bow g5, which straddles the contact-point f, and is ground-wire g2.

h represents a wire running' from the contact-point d5 to ahorizontal contact-spring h, secured in the upper portion of the frame E.

h2 represents a horizontal contact-spring, which is also secured inthe upper portion of the frame E opposite the contact-spring 7L.

h3 h4 represent two depending stationary contact-points secured to the top plate of the frame E, and against which the free inner ends of the contact-springs h h2 bear in their normal position, as represented in Fig. 3. The contact-points h3 h4 are connected by a wire h5.

h6 is a non-conducting push-button, which is mounted in the top plate of the frame E, and which bears upon the free ends of the contact-springs 7L h2.

t' t" represent two contact-points arranged in the frame E, respectively, below the contact-springs 7L h2, so that upon depressing the push-button 7L the contact-springs 7L h2 can be separated from the contact-points h3 h4 and be connected with the contact-points c' t. The latter are connected with the operators listening-telephone I by wires t2 3. The contact-spring h2 is connected with the shank of the contact-point j' by a wire t1.

J represents a metallic case -or socket secured to the outer side of the frame E, made open at its top and connected with the contact-sprin g h2.

K represents a vertical contact-lever pivoted in the frame E in rear of the socket J, which latter is provided on its rear wall with two openings j j through which the upper and lower arms 7c 7c' of the lever K play. The lever K is held by a spring 7a2 in a position in provided with a which one of its arms projects into the socket i J, said spring being connected with the lever in front of the pivot k3 thereof, as clearly shown in Figs. 3 and 4. The upper arm 7e of the lever K is made of non-conductin g material and the lower arm k is made of conducting material. The lower arm 7u is connected with a power-generator L by a wire Z. The lever K is provided with a stop 7e", which limits the forward movement of its lower arm.

M represents a plug, which is connected with the main wire h by a wire m, spiral spring m', and cord m2: The latter is wound upon a spool m3, in which the spiral spring m is arranged so as to wind the cord upon the spool when the cord is released. The spool rotates upon an arbor mt The end of the plug M is beveled, so that upon inserting the plug into the socket J the plug, coming in contact with the lower arm 7c ot' the lever K, forces the lower arm backwardly until the point at which the spring 702 is'attached to the lever K has passed the dead-center, when the spring continues to turn the lever K ou its pivot, thereby separating the lower arm 7s from the plug and holding the lever in the position represented in Fig. 3. In this position of the lever the upper arm 7c projects into a notch mi formed in the plug. The socket J is provided with a'clamping-spring n, which is deflected upon inserting the plug and which holds the plug in position in the socket. The plug may also be provided with a nose or projection n', which enters a notch n2 in the rear wall of the socket J, for more securely holding the plug in place.

Each subscribers line is provided at the central olice with one of the frames E and its appurtenances and with a plug M. Connection is made with a called lineon the same switch-board by inserting the plug M of the calling-line into the socket J of the called line.

O represents a horizontal metallic socket secured in the upright portion A of the switch` board and forming an outpoint, which is conneeted by a wire o with the vertical shiftingrod B of the same subscribers annunciator located on a different switch-board, as indicated in Fig. 1. Each switch-board is provided with as many outpoints O as there are subscribers connected with the other switchboards or sections in the same exchange.

o o2 represent two contact-springs arranged side by side in the front portion of the socket O, and secured with their bent front ends to the front slde of the switch-board.

0B o4 are wires connecting the springs 0 0e with the operators listeningtelephone I by means of the wires t2 The contact-spring o is provided on its outer side with a non conducting projection o6, which prevents the spring from coming in contact with the socket O, and the side of the latter is provided with `an opening oT for the same purpose.

P represents a contact-lever pivoted to the upper side of the socket O, so as to swing in a vertical plane, and having its front arm p constructed of non-conducting material and its rear arm p of conducting material. The lever P is pivoted to the socket O by a nonconducting support p2, which prevents con@ tact of the lever with the socket. The top plate of the socket O is provided with an opening through which the arms of the lever project into the socket. The conducting-arm p of the lever P is connectedwith the powergenerator L by a wire p3. The lever P is held in position with one of its arms projecting into the socket O by a fiat spring p1', bearing upon a non-conducting projection p5 of the lever. The movement of thelever P is limited IIO in one direction by the end of the springpL1 and in the other direction by a stop p6, formed on said spring.

The plug M is provided on one side with a conducting projection q and on its opposite side with a non-conducting projection q, as represented in Figs. 7 and S, so that upon inserting the front portion of the plug into the socket O the conducting projection q w ill make acontact with the spring o', while the non-conducting projection q will press against the spring 02 and force the latter into contact with the socket O. By this means the operators telephone is looped into the line with which the socket O is connected. Ey pushing the plug farther into the socket O the front end of the plug strikes against the rear arm p of the lever P, thereby connectin g the generator L with the line 0, with which the socket O is connected, which causes the ringing of the callbells on the called line o and the calling line with which the plug M is connected. The socket O is provided with a clampingspring r, whereby the plug is held in the socket, and, if desired, the latter may be provided with a notch r', in which the nose n of the plug engages for the purpose of holding the plug more securely in place.

S represents a push-button attached to the frame E, and connected with the generator L by awire .5", the contact-lever K, and wire l. The push-button S is arranged in rear of the contact-spring Z, so that upon pressing the button forwardly the generator is connected with the line of which said contact-spring forms part, thus enabling the operator to ring up the subscriber.

Vhen a subscriber calls the central oliice, the annunciatonapron a3 of the subscribers line drops and shifts the lockingbolt a, thereby releasing the upright bar B, which latter descends and shifts the ground-lever G so as to break the contact between the bow g and the point f, whereby the ground-connection is automatically broken and lield open at the central office, as represented in Fig. 1l. This enables the calling subscriber to determine whether his call has been received. The operator now swings the upper end of the pivoted frame E backwardly, whereby the contact point f is swung downwardly. This brings the point f in contact with the lower prong of the bow g', whereby the groundconnection is restored, and depresses the front end of the lever G, whereby the bar B is returned toits elevated position. The operator now releases the frame E, which is returned to its vertical position by the spring e. The operator next loops in the listening-telephone I by pressing upon the push-button 7i, and ascertains which subscriber is to be called. If a subscriber is wanted whose line is connected with the same switch board or section, the operator inserts the plug M of the callingline into the socket J of the called line. Dur ing the iirst portion of the inward movement of the plug the latter comes in contact with scribed.

the lever K of the called line and places the generator in communication with both the calling and called lines. This causes the bells vof both lines to ring simultaneously and automatically opens the ground-connections g2 of both subscribers by dropping the shifting-bars B of both annunciators. The continued inward movement of the plug causes the lever K to be shifted to the position shown in Fig. 3, thereby disconnecting the lever from the plug. 4The called line is now connected with the calling line through the plug M, socket J, contact-spring h2, contactpoint h4, wire h5, contact-point h3, contact-spring 7L', wire h, contact-point (Z5, to and through the annunciator, contact-point d2 to the subscribers instrument. Upon withdrawing the plug M from the socket J the shoulder m at the outer end of the notch fm?" strikes against the upper arm k of the lever, and shifts the latter so as to throw the lower arm 7c forwardly, as represented in Fig. l, thereby making the lever ready for the next insertion of the plug.

If a subscriber is wanted whose outpointsocket O is connected with the switch-board, the operator inserts the front portion of the plug M of the calling line into the socket O of the called line, whereby the operators listening-telephone is -looped into the called line. If the operator finds that the called line is engaged, the plug is withdrawn without interference with the called line. If the operator finds the called line to be disengaged, the plug is fully inserted int-o the socket O.

IOO

The inward movement of the plug brings the Y latter in contact with the contact-lever P, whereby the generator is connected with both the called and calling lines, and the bells of both lines are rung simultaneously'. This causes the groundconnections of both lines to be opened automatically, as above de- The final inward movement of the plug causes the lever P to be shifted so as to disconnect it from the plug, in the same manner in which the lever K is disconnected from the plug. The called line is now connected with the calling line, through the wire o, the socket O, the plug M, and the conducting parts connected with the plug. Upon withdrawing theplug from the socket O the shoulder m of the plug shifts the lever P in the same manner inwhich the lever K is shifted.

I claim as my inventionl. The combination, with the main line and a movable plug M, connected therewith, of `a socket O, also connected with the main line, a contact-lever P, connected with the generator and provided with a conducting-arm p and a non conducting arm p, and a spring, whereby one of said arms is projected into the socket upon inserting the plug into the socket and a connection made between the main line and the generator, substantially as set forth.

2. The combination, with the main line and the frame E, of a socket J, attached to the IIO frame E, a contact-lever K, projecting into 4. The combination, with the frame E, the

socket J, and the contact-lever K, of the oontaot- Springs 71, h2, Connected eontaetpoints h3 h4, push-button h6, eontaetpoints /L' e", and a listening-telephone l, Connected with the contact-points z' il', substantially as set forth.

5. The combination, with the frame E, of a contact-lever K, having' a conducting-arm 7e', Connecting with the generator, and a noneondueting arm 7c, of a socket J and a plug M, provided with a shoulder m6, substantially aS Set forth.

G. The combination, with the plug M and its socket O, eaeh connected with the niain line, of a pivoted Contact-lever P, Connected with the generator and provided with Contactarins p p', and a spring p4, whereby the oontaet-lever is held with one of said arms in Contact with the plug, substantially as set forth.

7. The Combination, with the ground-lever G, having a Contact bow g', of the pivoted frame E., provided with a contact-point f,pro jeoting between the prongs of the Contact bow g', substantially as set forth.

8. The combination, with an out-socket O, connected with the main line, of two contactsprings o 02, connected with the listeningtelephone, one of said springs being insulated frein the socket, and a plug M, adapted to be inserted between said springs and provided with a non conducting portion q', substantially as forth.

9. The Combination, with an out-socket O, Connected with the main line, of two Contactsprings o 02, Connected with the listeningtelephone and arranged in the front portion of the socket, anda contact-lever P, connected with the generator and projecting into the rear portion of the socket, substantially as set forth.

Witness my hand this 27th day of January, 5o

Witnesses:

JNO. J. BONNER, CARL F. GEYER. 

